Electronic Telegram No. 1054
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVAE 2007hq, 2007hr, 2007hs, 2007ht
     The "Nearby Supernova Factory" collaboration (G. Rigaudier and E.
Pecontal, Centre de Recherche Astronomique de Lyon; C. Buton, Y. Copin,
E. Gangler, G. Smadja, and C. Tao, Institut de Physique Nucleaire de Lyon;
P. Antilogus, S. Bailey, R. Pain, R. Pereira, and C. Wu, Laboratoire de
Physique Nucleaire et de Haute Energies de Paris; G. Aldering, C. Aragon,
S. Bongard, M. Childress, S. Loken, P. Nugent, S. Perlmutter, K. Runge,
R. C. Thomas, and B. A. Weaver, Lawrence Berkeley National Laboratory,
Berkeley; C. Baltay, A. Bauer, D. Rabinowitz, and R. Scalzo, Yale
University; D. Birchall, Institute for Astronomy, University of Hawaii,
Hilo; and J. Cough and J. Holtzman, New Mexico State University, Las
Cruces) reports the discovery of four supernovae in images obtained using
the QUEST-II camera on the Palomar 1.2-m Schmidt telescope, operated by
the Palomar-QUEST Consortium.  SN 2007hr was not detected on an image
taken on Aug. 20, and 2007hs was not detected on an image taken on Aug. 9
(no limiting-magnitude information was provided).  Spectra (range 320-1000
nm), obtained during Sept. 5.3-5.6 UT with the SuperNova Integral Field
Spectrograph on the University of Hawaii 2.2-m telescope, show that 2007hq
is about one week past maximum and 2007ht is 1-2 weeks past maximum.
The R-band discovery magnitudes and astrometry tabulated below were
derived from comparison with the USNO-B1.0 catalogue.

SN       2007 UT       R.A. (2000.0) Decl.      Mag.    z      Type
2007hq   Sept. 1.3    0 10 06.68  -16 16 24.3   19.7   0.09    Ia
2007hr   Sept. 1.5    4 12 07.14  - 7 35 13.2   18.6   0.03    II
2007hs   Sept. 2.2   17 11 40.31  +36 30 03.7   19.4   0.07    II
2007ht   Sept. 2.3    0 34 33.81  - 1 13 03.1   19.2   0.07    Ia


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 September 6                 (CBET 1054)              Daniel W. E. Green